6 replies to this topic

[bloodchains]

So here's a program that passes command-line arguments. I've never used the parseDouble method before, so I don't know what I'm doing wrong. I'm supposed to convert the elements in the args array to double and add their values. Here's the code:

public class Double
{
    public static void main(String[] args)
    {
        double sum = 0;
        double d;

        for (String b : args)
        {
            d = Double.parseDouble(args);
            sum += d;
        }

        System.out.println("Sum of arguments: " + sum);
    }
}

I keep getting this error:

symbol  : method parseDouble(java.lang.String[])
location: class Double
            d = Double.parseDouble(args);
                      ^
1 error

Tool completed with exit code 1

[lethalwire]

Your variable args isn't just a String. It is a String[]. Or an array of Strings.

The paramater for Double.parseDouble is a String, not a String[].

Simply, you've mistakenly put args inside of the parseDouble method instead of 'b.'

[bloodchains]

lethalwire said:

Your variable args isn't just a String. It is a String[]. Or an array of Strings.

The paramater for Double.parseDouble is a String, not a String[].

Simply, you've mistakenly put args inside of the parseDouble method instead of 'b.'

I tried that, it still doesn't work. The error is "cannot find symbol." Isn't Double an implicit class? Or do I have to create it myself?

[lethalwire]

Your code compiles fine in eclipse with you replace args with b.

[ZekeDragon]

public class Double

:|

You cannot name your class Double. Double is a class in java.lang. You must name your class something else. The reason you're getting "cannot find symbol" is because the Java Compiler thinks your reference to Double meant the class you were writing now, which does not have a parseDouble method.

@lethalwire: Did you use your own Main test class?

[wim DC]

You can always use java.lang.Double.parseDouble.
But I must say it's kinda confusing to name your class Double.

[lethalwire]

ZekeDragon said:

public class Double

:|

You cannot name your class Double. Double is a class in java.lang. You must name your class something else. The reason you're getting "cannot find symbol" is because the Java Compiler thinks your reference to Double meant the class you were writing now, which does not have a parseDouble method.

@lethalwire: Did you use your own Main test class?

Yes I did, doh! If I would have used Double I would have seen how obvious that problem was. :)